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#1
11-20-2010, 09:44 PM
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rpm gauge quit working
Tach does not work. wondering if it is in the wirenes harness
or the sensor itself. Are there any way of checking the wirenes harness to see if it is defective or the sensor itself. 
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#2
11-21-2010, 01:59 PM
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Hi Larry welcome to the forum - it would help your post if you stated on which car you have a problem.
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#3
11-24-2010, 05:30 AM
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Are all other accessories (clock,raido..etc)working? I would look at your fusebox first.
My tach went out the other day, and it was that , While I was at it , I replaced all the fuses... They are pretty flimsy ... css190e 91 2.6 gas .. hope it helps
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#4
11-25-2010, 05:53 PM
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RPM GAUGE QUIT WORKING
SORRY ABOUT NOT POSTING WHAT AUTOMOBILE THE TACH QUIT WORKING ON. IT IS A 1995 MERCEDES 300E DIESEL. I WOULD LIKE TO KNOW HOW TO TROUBLESHOOT IF THE PROBLEM IS WITH THE WIRING OR THE SENSOR ITSELF? SOMETIMES THE TACH WILL WORK IF THE ENGINE IS RIVING UP ABOUT 2500-3000 RPM THEN IMMEDIATELY IT DROPS BACK TO ZERO. I HAVE CHECKED THE FUSES AND FOUND NO TROUBLE WITH THEM. IN FACT I DO NOT THINK THE TACH IS FUSED, IF SO, I CANNOT FIND IT.
THANKS! LARRY L L
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#5
11-26-2010, 03:24 AM
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If I were you I'd clean all of the electrical contacts first and see if that helps. Do the easy and cheap first! It won't be a fuse problem - as in a blown fuse - if it works intermittently. You might need to clean up the contacts on the fuse though...
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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#6
11-26-2010, 12:19 PM
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Quote:
Since you have a diesel, you may wish to post in the Diesel Discussion -- the diesel experts hang out there. Your 1995 is the last year for the W124 chassis and the first year for the OM606NA engine so it is somewhat unique. Please don't write in capital letters; it is the Internet equivalent of shouting and some people consider it rude and won't help you with your problem. Jeremy
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#7
11-26-2010, 05:59 PM
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RPM gauge quit working
I cleaned the contacts on the fuses and it did not help my problem. It did
help my windshield wiper work continious on intermitten. Thanks! Jeremy thanks for the information. And thanks again for reminding me to not write in capital letters. I haven't heard this before so it is all new to me. I will make sure from now on that I do not write in capital letters. The wiring harness goes from the sensor down to the fly wheel cover and with a small bolt it looks through a hole in the fly wheel cover. Just wondering if there is a magnet on the fly wheel and the piece of copper on the end of the wiring harness picks up a small amount of signal and sends it to the sensor. If so I would think it would be less than voltage. maybe something like millivolts (sp).
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